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--- tutorial:mail:postfixrelay [2013-08-18 00:45] – root
+++ tutorial:mail:postfixrelay [2025-06-16 14:42] (current) – removed weichbr
@@ Line 1: / Line 1: @@
-{{tag>tutorial mail}}
-====== Let postfix only accept mails for addresses in Exchange ======
-===== Problem =====
-  * I use postfix as a backup for my Exchange. I want postfix to only accept mail for recipients which exist in Exchange.
-===== Requirements =====
-  * I assume you followed my first tutorial [[tutorial:mail:postfixredir|here]]
-  * Existing postfix installation (mine is on debian)
-  * Existing Exchange (2010 or 2013) installation
-----
-===== Step 1 =====
-  * Create the following PowerShell script on your Exchange server:
-  * <code>
-$ExcludeUsers = @("Administrator", "user1")
-Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
-# Get all valid recipients, excludes DiscoverySearchMailbox and every user alias included in ExcludeUsers
-$ValidRecipients = Get-Mailbox | where {$_.Alias -NotLike "DiscoverySearchMailbox*"} | where {$_.Alias -NotIn $ExcludeUsers}
-foreach ($Address in $ValidRecipients.EmailAddresses)
-{[string]::Format("{0}`tOK", $Address.AddressString)}
-</code>
-  * Run the script and save the output to a file like this: ''%%./script.ps > output.txt%%''
-----
-===== Step 2 =====
-  * Connect to yout server running postfix
-  * Upload the scriptoutput to /etc/postfix/relay_recipients
-  * Add the following lines to your /etc/postfix/main.cf:
-  * <code>
-relay_recipient_maps = hash:/etc/postfix/relay_recipients
-show_user_unknown_table_name = no
-</code>
-  * Reload or restart postfix
-----
-===== Step 3+ =====
-  * If your addresses change (added new or removed some) you have to repeat step 1 and 2